regress
I
verb
backslide, fall again into, fall back, fall behind, go back, move backward, pass back, recede, relapse, retrocede, retrograde, retrogress, return, reverse, revert, turn back
II
index
decline, deteriorate, escheat, recidivate, relapse (noun), relapse (verb), reversion (act of returning), revert
Burton's Legal Thesaurus.
William C. Burton.
2006